Anisotropic Cahn-Hilliard free energy and interfacial energies for binary alloys with pairwise interactions

Bellon, Pascal; Li, Qun

doi:10.1016/j.actamat.2021.117041

Cited by 2 publications

(1 citation statement)

References 31 publications

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“…This is an important result as commonly the reorganization of matter due to a thermal or multilayer instability is assumed to be isotropic. [ 40 ]…”

Section: Resultsmentioning

confidence: 99%

Strain‐Driven Thermal and Optical Instability in Silver/Amorphous‐Silicon Hyperbolic Metamaterials

Ocana‐Pujol

Forster

Spolenak

et al. 2022

Advanced Optical Materials

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Hyperbolic metamaterials show exceptional optical properties, such as near‐perfect broadband absorption, due to their geometrically‐engineered optical anisotropy. Many of their proposed applications, such as thermophotovoltaics or radiative cooling, require high‐temperature stability. In this work, Ag/a‐Si multilayers are examined as a model system for the thermal stability of hyperbolic metamaterials. Using a combination of nanotomography, finite element simulations, and optical spectroscopy, the thermal and optical instability of the metamaterials is mapped. Although the thermal instability initiates at 300 °C, the hyperbolic dispersion persists up to 500 °C. Direct finite element simulations on tomographical data provide a route to decouple and evaluate interfacial and elastic strain energy contributions to the instability. Depending on stacking order the instability's driving force is either dominated by changes in anisotropic elastic strain energy due thermal expansion mismatch or by minimization of interfacial energy. These findings open new avenues to understand multilayer instability and pave the way to design hyperbolic metamaterials able to withstand high temperatures.

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“…This is an important result as commonly the reorganization of matter due to a thermal or multilayer instability is assumed to be isotropic. [ 40 ]…”

Section: Resultsmentioning

confidence: 99%